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(No Model.) l L L W. D. WILLIAMS.

DENTAL HAND PIECE.

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AUNITED STATES PATENT OFFICE. j

WALTER DILLoN WILLIAMs'oE CAMDEMNEW JEEsEY, AssiGNoE or ONE- HALE rro A. J. EULLMEE, on sAME PLACE.

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To all whom it may concern,.-

DENTAL'HVAND-PIEQE.

sPEcIr-Icafrron forming part of Leiters Patent No. 382,673, aaiea May 8,1 ses.

Application niet august 2r', rear. seri-.una 24m01.111s menu.) y v,

Be it known that I, WALTER DILLONHWIL- LIAMS, a citizen of the United States, residing at Camden, inthe county of Camden and State of New Jersey, have invented certain new and useful Improvements in Dental Hand-Pieces;A and I do hereby declare the following to bea full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention relates to improvenected at the opposite end to the flexible rotary shaft of a suitable dental engine forrotating said drills, the object of my improvements being to provide a dental hand-piece that shall 'have the least number of parts atA the minimum of cost, one that will be simple, accurate, and reliable both in its construction and operation, and which is capable of 'ready operation to secure the drill in position or to release the same at pleasure by the employment of one hand alone.

To the above ends my invention consists of the novel features of construction and general arrangement of parts, as will be hereinafter fully set forth, and specifically designated in the claims. y

ln the accompanying drawings, Figure 1 is a side elevation of my improved dental instrument; Fig. 2, a vertical longitudinal section thereof', and Fig. 3 a detail view of the tubular shaft or spindle.

Similar letters of reference indicate like parts in the several figures of the drawings.

The outer casing, A, of the dental tool is cylindrical in shape, and tapers slightly toward the tool-holding end, and is adapted to receive the tubular shaft or spindle B, as fully shown in Fig. 2. i

The spindle B is formed in one continuous length, and provided at its outer end with two cones, a a', integral therewith, and located a short distance apart, the bevel-faces .of said cones projecting in opposite directions to each other, and the outer end of the spindle being bored out a suitable ldepth and diameter to4 receive the shank of the drill or tool, while elon` gated slitsvb are provided in the sides of the spindle below the outer cone, a, to form dexible jaws, `the said slits 'extending throughthe second cone, ct', as shown.

The cone a upon vthe outer end of the-spin-V dle' B is adapted torestin a correspondinglyshaped bearing in the tapering end of the casing A, while the opposite rear end of the spindle is adapted'to freely revolve in a bearing in ascrew-threaded shoulder, C, fitting the rear of the said casing, to provide a continuous straight journal having a true revolving center to take up all lost motion. Near the outer end of the spindle is provided a hollow sleeve, D, whichltsupon the said spindle, with its outer end impingingnormally upon the beveled surface of the cone a, to compress the fiexible jaws together through the medium of the spiral spring c, arranged upon the said spindle between the base of the sleeve D and the collar d, which is also adjustably fixed upon the spindle, as fully shown in Fig. 3.

At the lower end-of the hollow sleeve D, and

formed integral therewith, is provided a collar, e, against the upper surface of which' iinpinge the inner ends of the lugs f, projecting inwardly from the sleeve E, arranged upon the central part of the casing A.

. ThesleeveEis provided upon its outer surface with fine screw-threads adapted to engage with corresponding screw-threads upon the interior of the sleeve F, which ts over the same, and the sleeve E has its lugs f project-l ing inwardly into the-casing A, through the slots g in the sides of the same, so as to contact with the collar e of the hollow sleeve D to draw said sleeve downward from its engagement with the cone a of the ileXible jaws to open the same for the insertion or removal of the shank of the drill. i y

The two sleeves, E and F, are arranged upon the casing A between the collar h, formed integral with said casing, and the collar t', adjustably secured upon said casing, as'shown,

it being only necessary to give the outer sleeve,

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to open the iiexible jaws, and a similar turn of the outer sleeve, F, in 'the opposite direc* tion to secure the closing of the fiexible jaws.

It will be readily seen that the dental tool can be held in one hand and the sleeve F operated in either direction to open or close the lexiblejaws by the employment ofthe thumb and finger of the hand that holds the instrument.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

l.v In a dental handpiece, the outer easing having a rigid collar and an adjustable collar thereon, a female screw-threaded sleeve surrounding the casing and eloselyfitted between the collars, a male screw-threaded sliding sleeve surrounding the easing inside the other sleeve, having lugs which project inwardly througliopenings in the casing, and the spindie having a spring-actuated sleeve, substanzo presence of two witnesses.

WALTER DILLON WILLIAMS.

Witnesses:

WM. BIRD, L. B HUMPHREYS. 

